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Differences in ruminal bacterial structures among different treatment groups. Principal coordinate analysis (PCoA) was based on the operational taxonomic unit (OTU) data using unweighted and weighted UniFrac distances. Individual samples from C11, C12 and C13 in Group C (green); S11, S12, S13, S21, S22 and S23 in Group S (red); and E11, E12, E13, E21, E22, E23, E31, E32 and E33 in Group E (blue).
